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INVESTMENTS (Other Investments) (Details) - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2019
Dec. 31, 2018
Other Investments [Line Items]    
Other investments, at fair value $ 802,064 $ 787,787
Percentage of total fair value 100.00% 100.00%
Long/short equity funds    
Other Investments [Line Items]    
Other investments, at fair value $ 30,526 $ 26,779
Percentage of total fair value 4.00% 3.00%
Redemption notice period 60 days 60 days
Multi-strategy funds    
Other Investments [Line Items]    
Other investments, at fair value $ 165,123 $ 167,819
Percentage of total fair value 21.00% 22.00%
Multi-strategy funds | Other Redemption Restriction    
Other Investments [Line Items]    
Unfunded commitments related to other investments $ 39,000 $ 84,000
Multi-strategy funds | Minimum    
Other Investments [Line Items]    
Redemption notice period 60 days 60 days
Multi-strategy funds | Minimum | Other Redemption Restriction    
Other Investments [Line Items]    
Investment term 2 years  
Multi-strategy funds | Maximum    
Other Investments [Line Items]    
Redemption notice period 90 days 95 days
Direct lending funds    
Other Investments [Line Items]    
Other investments, at fair value $ 273,864 $ 274,478
Percentage of total fair value 34.00% 35.00%
Direct lending funds | Other Redemption Restriction    
Other Investments [Line Items]    
Unfunded commitments related to other investments $ 193,000 $ 210,000
Optional extension of investment term 3 years  
Direct lending funds | Minimum | Other Redemption Restriction    
Other Investments [Line Items]    
Investment term 5 years  
Direct lending funds | Maximum | Other Redemption Restriction    
Other Investments [Line Items]    
Investment term 10 years  
Private equity funds    
Other Investments [Line Items]    
Other investments, at fair value $ 60,285 $ 64,566
Percentage of total fair value 8.00% 8.00%
Unfunded commitments related to other investments $ 15,000 $ 16,000
Investment term 10 years  
Real estate funds    
Other Investments [Line Items]    
Other investments, at fair value $ 134,763 $ 84,202
Percentage of total fair value 17.00% 11.00%
Real estate funds | Other Redemption Restriction    
Other Investments [Line Items]    
Unfunded commitments related to other investments $ 100,000 $ 147,000
Real estate funds | Minimum | Other Redemption Restriction    
Other Investments [Line Items]    
Investment term 7 years  
CLO-Equities    
Other Investments [Line Items]    
Other investments, at fair value $ 17,798 $ 21,271
Percentage of total fair value 1.00% 2.00%
Other privately held investments    
Other Investments [Line Items]    
Other investments, at fair value $ 28,452 $ 44,518
Percentage of total fair value 4.00% 6.00%
Overseas deposits    
Other Investments [Line Items]    
Other investments, at fair value $ 91,253 $ 104,154
Percentage of total fair value 11.00% 13.00%
Hedge funds | Lockup Redemption Restriction    
Other Investments [Line Items]    
Fair value of other investments subject to redemption restrictions $ 63,000 $ 27,000
Percentage of fair value of other investments subject to redemption restrictions 32.00% 14.00%
Bank Revolver Opportunity Funds    
Other Investments [Line Items]    
Unfunded commitments related to other investments $ 50,000  
Investment term 7 years  
Optional extension of investment term 2 years